DIY torsion bushing for contra

[capturedbyrobots]

I was having a huge problem with my contra spring binding on one of my scoots.
It acted like it would stop shifting, and just bog.
I saw the Malossi Torsion control, but I'm not the "buying" kind of guy if I can
make something myself.

I use HDPE often, and it's such an awesome material.
Slippery, yet strong as hell. You know, cutting boards.. oh yeah.

I used a 1/4 in piece, with my hole saw, and came up with this.
It solved the problem. Now it shifts awesome.
I needed a bit of a stronger spring as well, so this actually shimmed it too.
If you didn't want a stronger spring,
I would use 1/8 HDPE or melt a channel into the plastic with a heated donor spring
(I used a torch to heat the donor spring. Keep in mind that only use a bad spring for the heating process,
as it would kill the temper from your spring)

Attachments:

[swakk]

as i read on books
hdpe don t like heat more than one hundred degree celcius or a little bit more
i m worried for the life of this mod because of this
can t you find ptfe ?

[capturedbyrobots]

Well, my belt doesn't like temps over 100 deg celcius either ,
so I should be good.
It hasn't deformed yet and where it's placed on the outer pulley,
it shouldn't get that hot, especially with a vented cover.

I get the HDPE for free at a local shop in scraps.
They didn't have PTFE available, just polyethylene.

[Enviromoto]

Cool idea Jason I may have to try this sometime.